Discussions

The question is simple. What is the most unique (or even strange) keepsake you have kept in your lifetime?  
 
One of mine for example is sand from Long Beach, perhaps the closest to an exotic beach you'll find in Canada. I remembered hearing shortly after how Sidney Crosby has maintained a collection of sand from all of the major beaches he's been to.  
 
Another that I regret not purchasing at the time is an actual bolt used in the Golden Gate bridge (sold at the gift shop on the bridge).  
 
Another example would be one fellow I know of in town that has a couple of seats from what I believe was the old Town Cinema in his basement movie theatre.  
 
What is yours? It could be something that reminds you of a certain event or occasion, something related to a closed business, a piece of a demolished building/structure and I'm sure tons of things one couldn't begin to dream of.